gear swaps

jeep_sport04 · 01-30-2008, 12:15 AM

i have a 2004 wrangler sport 5 speed and a np231 it has a 4" lift and i want to put 33's on it but before i do i want to regear the differentials. i have a dana 30 in the front with 3.73 gears and dana 44 in the rear with 3.73. i would like to know what all i would need to swap in 4.10 in bothand can i do it all myself. i will also be putting aussie lockers in both when i do the gear swap. thanks

Crashnburn80 · 01-30-2008, 12:42 AM

4.56 is the recomended ratio for a manual and 33s. Gear install is almost always recomended to be done by a professional, not just any mechanic, a gear professional. For this reason it is not recomended for the typical home mechanic to do it themselves.

yeahsowhat · 01-30-2008, 07:54 AM

Why? Just inquiring.

**DestructoJr** · 01-30-2008, 07:58 AM

Quote:

Originally Posted by yeahsowhat

Why? Just inquiring.

It requires a lot of precise measurments and there is very little leeway in doing the install. Its an expensive oops as well. Although with the FSM and general mechanical knowledge and all the required tools the setup can be done just take your time

**DestructoJr** · 01-30-2008, 07:59 AM

Quote:

Originally Posted by jeep_sport04

i have a 2004 wrangler sport 5 speed and a np231 it has a 4" lift and i want to put 33's on it but before i do i want to regear the differentials. i have a dana 30 in the front with 3.73 gears and dana 44 in the rear with 3.73. i would like to know what all i would need to swap in 4.10 in bothand can i do it all myself. i will also be putting aussie lockers in both when i do the gear swap. thanks

You will need the R&P for both diffs and a master install kit with shims and such

**Whybu1** · 01-30-2008, 09:47 AM

Set-up tolerance is in the 1/10000 of an inch range. Need a bearing press and a micrometer for sure. I was glad I took mine to a local guy who basically "taught" me as he did it.

**cvd** · 01-30-2008, 09:53 AM

Regarding lockers - the Aussie in front is a good choice (I have that). But I've read many times a full case locker (i.e. Detroit, Ox, ARB) should be used in back, instead of a lunch box locker like the Aussie.

Lunch box lockers don't ratchet as freely. You need the better ratcheting in back, which is under pressure (torque) most of the time.

Dogman · 01-30-2008, 11:10 AM

You will need a new carrier for the 44 (4.10 and numerically higher). That is unless you go with a full case locker.

Dogman · 01-30-2008, 11:11 AM

Oh, and check this out to see what all is involved: http://www.pirate4x4.com/articles/tech/billavista/Gear_Setup

chefdab · 01-30-2008, 12:04 PM

Quote:

Originally Posted by dogman

You will need a new carrier for the 44 (4.10 and numerically higher). That is unless you go with a full case locker.

Are you sure about that? I asked about that when I got my 44 re-geared and they told me that I wouldn't need a new carrier. I went from a 3.73 to 4.56 and either they didn't need a new carrier or they didn't charge me for one because it wasn't listed on my sales invoice.

**Wheelin98TJ** · 01-30-2008, 12:12 PM

Quote:

Originally Posted by chefdab

Are you sure about that? I asked about that when I got my 44 re-geared and they told me that I wouldn't need a new carrier. I went from a 3.73 to 4.56 and either they didn't need a new carrier or they didn't charge me for one because it wasn't listed on my sales invoice.

The D44 carrier break is 3.73/3.92.

The only way you can use 4.10 gears on a 3.73 carrier is if you use a "thick" gear set or a ring gear spacer.

Southern Bred · 01-30-2008, 12:35 PM

I don't know if this was a typo but 1/10000 of an inch? There is nothing in the set-up of a R/P at that tolerance. Maybe the mech. was talking about the press fit of the pinion bearing?

Quote:

Originally Posted by Whybu1

Set-up tolerance is in the 1/10000 of an inch range. Need a bearing press and a micrometer for sure. I was glad I took mine to a local guy who basically "taught" me as he did it.

**Whybu1** · 01-30-2008, 02:32 PM

"Thick" 4.56 gears do not require a new carrier. I did add one too many zeros on the fraction it should be 1/1000th of an inch.

Quotes taken from install directions of gears:
When changing the backlash bear in mind that the backlash setting changes about 0.007” for each 0.010” that the carrier moves. For example: Move the carrier 0.010” toward the pinion to decrease the backlash by 0.007”. Move the carrier 0.010” away from the pinion to increase the backlash by 0.007”.
While not all ring-and-pinion sets will react exactly this way, these figures serve as a good guideline.

When changing the pinion depth, make large changes until the pattern is close to ideal. Consider 0.005” to 0.015” a large change and 0.002” to 0.004” a small change. Intentionally make adjustments that move the pinion too far at first.

0.001 is 1/1000th of an inch